Discard server – this protocol is only installed on machines for test purposes. The service listening at this port (both TCP and UDP) simply discards any input.

See also: [RFC863], CVE-1999-0060
Intrusions: Ascend kill
This exploit kills Ascend routers by sending them a specially formatted malformed TCP packet. On certain versions of the Ascend operating system, the router can be forced to cause an internal error, resulting in the router rebooting.